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MODEL 91,92 Cirouit Data ZENITH RADIO CORP.

MODEL 91 (2014) SERIAL NUMBERS AFTER 373,334 T°ODEL 92 (2014) SERIAL NUMBERS AFTER 301,394 (4B)

In all receivers,bearing serial numbers 373,334 on model 91 and 301,394 on model 92,or higher,the manual control has been removed from the A.V.C. cathode and placed in the grid circuit of the first A.F. stage. A tapped resistor takes the place of the original control. By use of this new system,the automatic volume control operates independently and at full efficiency,manual volume being controlled by varying the audio output.

Since the A.V.C. or R.F. circuit remains constant,the tuning meter will show maximum swing on the station at any manual control setting. Originally the meter action decreased as the volume was lowered.

The parts list shown previously,except for the substitutions given below,should be used when ordering replacement components.

PARTS CHANGE. 1 Audio volume control,part # 63-212 List 1.65 1 Center tapped resistor,part # 63-.210 List 0.50

Deduct the 63-171 volume control.

MODEL 91 (2014) SERIAL NUMBERS AFTER 375,532 MODEL 92 (2014) SERIAL NUMBERS AFTER 302,007 (4C)

All ten -tube Zenith Superheterodynes after the above serial numbers will incorporate a variable Sensitivity Control in place of the original Local -Distance switch. The diagram (*) indicates its position as being connected into the I.F. cathode. In addition to the control unit the first detector coil has been replaced by one having slightly different construction to provide; equal sensitivity over the entire tuning range. It is not advisable to make this change in receivers subsequent to the above numbers,for the reason that each complete set of chassis coils must be inductively matched,otherwise the efficiency of the receiver will be seriously affected.

The following alteration makes the parts list directly applicable to the improved models:

DEDUCT 1 Local -Distance switch,part # 85-31 1 First detector coil, " # S-997 1 Eight megohm resitor " # 63-224 1 250,00 ohm resistor " # 63,135

ADD 1 Sensitivity Control, part # 63-228 1 Det. coil assembly " # S-2104 1 Bypass condenser, " # 22-115 1 50,000 ohm resistor, " # 63-136


ZENITH PAGE 2-7

MODEL 91,92 ZENITH RADIO CORP. Balancing Notea

Balancing Chassis

Every Zenith Superheterodyne Receiver is carefully balanced on laboratory equipment before leaving the factory

and should not require further attention in this respect. However, in the event that some part of the R. F. circuit has

been changed, or the adjustments ghafted by mishandling, the chassis may be rebalanced as follows:

If an oscillator is available more accurate results will he obtained It should be accurately calibrated from 1500 to

550 kilocycles and should also have provision for generating a 175 kilocycle signal. In cases .where an oscillator is not

available a fairly good result may he had by listening to stations which operate as nearly as.possible to the extreme ends

of the dial. Although an output meter will give most accurate result,, satisfactory adjustments can be made simply by

listening to the speaker. The chassis should be removed from the cabinet so that all adjustments are easily accessible. Next place the test

oscillator in operation and connect it direct to the antenna and ground posts of the receiver. It should then be set to

1500 kilocycles and the receiver tuned to the same reading on the dial. If the oscillator is not accurate the stations

will not be received tin their proper calibration. If a station is used for this purpose, the dial pointer should first be set,

to the exact frequency of the station being received. Beginning with the variable condenser tuning section at, the ex-

treme left, which tunes the oscillator circuit, the trimmer should be regulated for maximum response, in either the loud

speaker or output meter. It will be noticed that the second section does not employ a vernier adjustment. This stage

'is resonated by adjusting the antenna compensator` knob as explained in the instruction card. The third, or 1st R. F:

trimmer, is adjusted in the same manner as the oscillator. If at any time the volume reaches a very high level, so that tt

is not possible to determine slight changes, it should be reduced by means of the volume control knob so as to be barely

audible. The fourth, or 1st detector section, is next in order and its trimmer should also be adjusted for resonance.

CONNECT 1500.550 K . CONNECT 175 K.C. OSCILLATOR TEST OSCILLATOR HERE FOR HERE TO PEAK INTER -

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PRE -SELECTOR, SCREW ` 1ST R

After the vernier adjustments have been completed the test oscillator should be set at 550 kilocycles and the dial o the receiver turned until the oscillator signal is tuned in. Now the oscillator padding condenser (see fig. 3) should be very carefully adjusted with a screw driver for maximum output of the receiver, while rocking the tuning condenser back and forth over the signal. This padding adjustment brings the oscillating circuit of the receiver in resonance with the remaining tuned circuits and, thereby, enables it to tract accurately over the entire scale. The receiver will now operate at full efficiency and all- stations will be received at their proper calibration. If this is not found to be entirely so, the entire balancing operation should be repeated.

The intermediate transformers used in the ten tube Superheterodyne have been accurately peaked at 175 kilocycles on a temperature controlled crystal oscillator before leaving the factory.. It is not recommended that their adjustments be tampered with unless an oscillator is available which is very accurately calibrated at 175 kilocycles, or unless the serviceman is absolutely certain the trouble lies in their adjustment. However, if it is necessary to check the adjustments, the 175 K. C. test oscillator may be connected to the grid terminal of the 1st detector through a .00025 fixed condenser. The ground lead of th; test oscillator is connected to the ground post of the' receiver. The oscillator tube must he removed from the chassis while this operation is being performed. Four adjusting screws are provided under the chassis directly beneath the intermediate transformers, which tune the plate circuit of the 1st detector, grid and plate circuits of the I. F. stage, and gold circuit of the second detector. (See wiring diagram.) Beginning with the 2nd detector grid vernier, each adjusting screw should, in turn, be set for maxinuun signal output from the speaker or output meter. For best results the verniers should be gone over twice. in the same aotatiun always keeping the output from the test uscal lator at the weakest possible .strength in order to determine slight variations in volume.


PAGE 2-8 ZENITH

MODEL 91,92 Parta Lint

22-112 22-113 S-997

'22-126 63-172

ZENITH RADIO CORP.

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RESISTORS 63-111 2M Ohm 1 Watt (1st A F Cathode) $ .30 63-121 100M Ohm 1 Watt (2nd Dct. Plate) .30 63-131 400 Ohm 1/2 Watt (A.V.C. Voltage Divider) .30 63-135 25M Ohm 1/2 Watt (2nd Detector Cathode) .............................. .30 63-13e 250M Ohm

1/2%

Watt (1st A. F. Grid) .30 63.140 1 Meg. Ohm Watt (Oscillator Grid) .30 63-144 3 Meg. Ohm 1/2 Watt (A.V.C. Grid) .30 63-146 2M Ohm 1/2 Watt (1st A.. F. Cathode) .30 63-166 1400 Ohm 1/) Watt (3 Used. See Footnote) .30 63-167 8M Ohm 1 Watt (A.V.C. Divider) .30 63-168 3600 Ohm .2 Watt (Plate Voltage Divider) .50 63-169 400M Ohm 1/2 Watt (A.V.C. Plate) .30 63-170 2800 Ohm 2 Watt (Plate Voltage Divider) .50 63-171 Manual Volume Control' and Switch Assembly 1.65 63-172 Tone Control 1.00 63-173 750 Ohm Metal Mounting (Power Tube Bias) .40 63-180 1M Ohm 1/2Watt (1st Detector Cathode) .30 63-188 41/2 Meg. Ohm %z Watt (A.V.C. Plate) .50

Note: All resistors employed in this receiver are narked in accordance with R. M. A. standards. Color code charts may be obtained by writing direct to the Erie Resistor Corp., Erie, Pa.

S-912 Intermediate Transformer Complete (2 Used) (Specify with or without grid lead) $2.50 S-916 Antenna and 1st R. F. Coils 75 S-997 1st Detector Complete 1.25 S-999 Oscillator Coil Complete 1.25

Note: 22-112 Filter Choke By-pass and 1st Audio Coupling Condensers. 22-113 1st R. F., lit Det. and I. F. Screen. 2nd Det. and A. F. Cathode. 22.115 2nd Det. and I. F. Grid Return. 1st Det. Cathode. 63-166 1st R. F.. 1st Det. and I. F. Grid Return Resistor.


ZENITH PAGE 2-9

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A new development in the form of capacity coupling is used between the R. F. stages. Close exami- nation will reveal the fact that it comprises a single band of bus -bar wire. This band is connected from the plate terminal of the preceding R. F. stage and coupled to the grid coil of the following R. F'. stage. The position of this band is permanently adjusted at the factory and should never be altered or tampered with unless the available line voltage is extremely low.

The distance from the coupling band to the grid or top end of the R. F. coil entirely governs the stage coupling and efficiency of the set. If this band is too close to the grid end, excessive coupling will result, causing a decided lack of selectivity. If the band is placed too low, the result will be a lack of sensitivity. Midway between the coil winding is the exact and most efficient operating position. If it is

found necessary to reset this band, insulating cement or other fastening substance should be applied to hold it in position, since loose vibration would cause frequency flutter.

The R. F. plate chokes are concealed beneath the R. F. coil, base, between the base and sub -panel. These chokes have an inductance of 6.75 M. H. and can be distinguished from the detector plate choke by the fact that they have 150 less turns. If an occasion arises which necessitates removing an R. F. choke, the serviceman should make certain that the Vs" spacing is maintained between the choke and the R. F coil base. To neglect this important adjustment may cause erratic operation of the receiver

Occasionally, and especially if the receiver has remained idle for a long length of time, it may have a

tendency to oscillate. This is always doe to poor contact between the wipers and rotor bearings of the variable condenser gang. It may be overcome by cleaning both parts with fiue sandpaper or by n'colving the dial several times to remove oxidization at that point.

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When resonating the variable condenser system for most efficient receiver performance. it will be noticed that an entirely new and fool -proof system of locking the verniers has been employed. The large locking nut may be loosened with a No. 6 Spintite wrench and the vernier screw to-ned with a small pointed screw driver

Proper method of balancing is accomplished by setting the antenna input control first on the No. 1

position. A station of low wavelength should be tuned to resonance on the dial. Adjust each trimmer con-

denser to exact resonance or so that it is set to peak volume. After this has been done, the input control should be set to the No. 2 position and the antenna section trimmer readjusted.

Upon completion, make certain that the wavelength of the station chosen corresponds to the proper wavelength reading on the drum dial.


ZENITH PAGE 2-11

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63-135 63-139 63-140

Resistors

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ZENITH RADIO CORP.

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MODEL 103 Chassis Layout Parts List

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'COILS--

MISCELLANEOUS 19-21 Grid Clip 44-4 Phono Jack Base Assembly. 46-40 Tuning Knob 46.55 Control Knob (3 used). .20 49-38 Dynamic Speaker 25.00 52-25 Speaker Multicord .45 57-308 Dial Escutcheon Plate .80 57-309 Meter Escutcheon Plate .35 73.8 Small Set Screw for Auto Coupling..... .01 78-36 Z-51,Socket .20 78.37 Z-27 Socket .20 78-38 Z-24 Socket .20 78-44) Z-80 Socket -20 78-41 Z-45 Socket .20 78-42 Amperite Socket .15 83.252 Speaker Multicord Terminal. Strip .20 85-24 Phono Switch .75 85.32 Local Distance -and Mute Switch 1.00 93-147 Electrolytic Condenser Insulating Washer .02 93.102 110 volt 60 cycle Power Transformer 8.00 95-116 110 volt 25 cycle Poiver Transformer 13.50

114.6 Large Set Screw for Auto Coupling .05 130-2 2 amp Fuse - .10 143-11 Auto Coupling Collar .85

S-1037 Auto Control Shaft Assembly .90 MS -176 Power Choke 4.00 MS -177 Audio Transformer (Six Lead) 5.50 MS -178 Audio Transformer ...... (Five Lead) 5.50

CONDENSERS 22-82 .001 Mfd. ...( 2nd Detector Plate) $ .30 .22-89 .1 - Mfd. ...(2 used, see footnote) .85 22-91) .1 Mfd. ...(2 used, see footnote) .55 22-107 .1 Mfd. ...(5 used, see footnote) .85 22-112 .1 Mfd. ...(Choke Bypass) .... .33 22.119 6. Mfd. ...(Electrolytic) 2.50 22-123 Four Gang Variable . 10.00 22-125 8. Mfd. ...(Electrolytic) 1.50 2.2-120 .006 Mfd. ...(Tone Control) .55 22-127 .000025 Mfd. ...(A. V. C. Coupling) .35 22-129 Padder .75 22-130 .0001 Mfd. (R. F. Coupling) ... .20

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S-919 2nd Detector Plate Choke and Bracket... .... . .... S-1063 Pre -Selector (Coil Only) S-1073 1st R. F. (Coll Only) S-1085 1st Detector (Coil Only) S-1060 I. F. Transformer (Specify with or without Grid Lead) S-1067 Oscillator .(Coil Only) S-1068 2nd R. F. Untuned Transformer S-1072 Coupling Coil

25M 1 Meg 2M

1400 400M

16400 6M

750 5M

DIAL ASSEMBLY S-1903 Dial Light Socket and Clip (less lamp). $ .010 S-1009 Tuning Shaft and Bracket Assembly. 1 50 8.1010 Drum Gear and Cans 85 S-1106 Dial Pointer and Reflector Plate 1.50 S-1110 Dial Strip and Bracket .85 6-14 Pointer Arm Bearing .20

15-12 Dial Light Clip .33 76-110 Dial Elevator Shaft 10 80-72. Pointer Arm Tension Spring . .08 94-119 Roller Bearings .08

100-18 21/2 volt Meter Lamp .25 100-20 314 volt Dial Lamp . . .60 122-4 Tuning Meter and Cord . . .

2.25 148-3 Dial Elevator Arm - ,:35

RESISTORS Ohm... (1st, 2nd Detector Cathode) . - . . Ohm... (Oscillator Grid) Ohm... (2nd Letector and A. F.) ... Ohm... (R. F. and I. F. Grilli Return) Ohm... (A. V. C. Plate) . . Ohm... (A. V. C. Divider, Metal Mtg.) ... Ohm... (Voltage Divider, see footnote).. Ohm... (Power Bias) .. Ohm... (2nd Detector Grid)

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IMPORTANT: GIVE SERIAL NUMBER OF RECEIVER ON ALL PARTS ORDERS. ALL PRICES ARE SUBJECT TO REGULAR DISCOUNT AND CHANGE WITHOUT NOTICE.

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PAGE 2-18 ZENITH

MODEL 103 Chassis 2017

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MODEL 103 Chassis Layout Voltage

ZENITH RADIO CORP.

Socket Voltages

Type Position Fil.

Volts Plate Volts

Control Grid Volts

Cathode Volts

Plate M. A.

S. G. Volts

Z-51 lst. R. F. 2.2 185 - 9. 0. 2.5 80

Z-51 2nd. R. F. 2.2 200 - 3.9 0. 3. 84

Z-24 1st Dct. 2.2 185 0. + 7. .25 70

Z-27 Osc. 2.2 80 0. 0. 7. 0

Z-51 1. F. 2.2 185 - 4. 0. 3. 90

Z-5 I I. F. 2.2 185 - 4. 0. 2. 90

Z-27 2nd. Da. 2.2 185' 0. +17.5 .5 0

Z-27 1st. P. P. 2.2 165 0. +12.5 3. o

Z-27 1st. P. P. 2.2 165 0. +12.5 3. 0

Z-45 2nd. 1'. P. 2.3 240 -48. 0. 36. 0

Z-45 2nd. 1'. P. 2.3 240 -48. 0. 36. 0

Z-24 A. V. C. 2.3 30 - .4 0. 0. 45

Z-80 Rect. 5 350 0. 0. 70. 0

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PAGE 2-20 ZENITH

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ZENITH PAGE 2-21

ZENITH RADIO CORP. MODELS 500,501,503,514,

515,516;600,604, 606,610,616,618

Chassis 2037

63-121

Parts List Resistors

1001( ohm,) Watt (2nd Detector Plate/ 63-135 25M " * " (2nd Detector Cathode) 63-137 250M " (Oscillator & Power Grid) 63-140 1 meg" (A.V.C. Screen) 63-160 100M " (A.V.C.Plate) 63-169 400M " " (A.V.C. Grid)

63-239 24M ohm 1 Watt (Oscillator Plate) 63-244 500 " á " (1st Detector Cathode) 63-251 Voltage Divider (six tap) 63-252 Voltage Divider (five tap)

Coils and Choke' 20-30 Antenna Coil 20-31 Oscillator Coil 20-35 Detector Coil 95-133 let & 2nd I. F. Transformer

Condensers

22-112 22-113

.1 mfd 300 volt(2nd Detector Screen & Power Grid)

.5 " (R.Ftlet Detector & I.F.Grid Return)

22-115 .1 " 200 volt(Four used, see below)

22-117 .5 " . (R.F.let Detector, & I.F. Screen)

22-137 .05 " 400 volt(Oecillator Plate) 22-147 .0005 600 volt(2nd Detector Plate & A.V.C.Screen)

22-170 .1 mfd 400 olt(R.F.& let Detector Plate,2nd Detector Platel.. 22-171 .05 " 600 volt(Tone Control)'

22-172 2. " 450 volt(Filter) 22-173 8. " 500 volt(Filter)

Socket Voltages

Tube Type Position

Fil. Volt.

Plate Volt.

Cath. Volt.

Screen Volt.

Supp. Volt.

Plate Current

Z-58 R.F. 2.4 190 0 95 0 7.

Z-58 let Det. 2.4 190 2.3 95 2.3 4.

Z-56 Oec. 2.4 100 0 - - 4.

Z-58 I.F. 2.4 190 0 90 0 2_

Z-57 2nd Det. 2.4 90 -60 70 -60 .2

Z-57 A.Y.C. 2.4 -10 -65 -2 -65 0

Z-59 Power 2.4 175 -70 165 -70 25

Z-80 Rect. 5,_ _ 350 _ - - - 3fi

Line 115 Volts

All readings,with exception of heaters, Use 1,000 ohm per volt D. C. meter.)

All Controls Maximum

taken from socket connections to ground.

BALANCE I.F. frequency at 175 K.C. Condenser gang at 1500 K.C. and oscillator

pad de r at 600 K.C.


PAGE 2-22 ZENITH

MODELS 500,501,503,514, 515,516,600,604, ZENITH RADIO CORP. 606,610,616,616

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